>Give your Samsung Galaxy S II AT&T that extra juice you need so you could enjoy your phone even more with the added capacity. This extended battery features 3200mAh of power from the highest quality Japanese Cells. The Seidio extended life battery provides up to triple the capacity of your original standard battery. The package includes a door finished to matched your phone.

This extended battery will work with the Samsung Galaxy S II AT&T version only, this will not work with the T-Mobile or Sprint version.

>Give your Samsung Galaxy S II AT&T that extra juice you need so you could enjoy your phone even more with the added capacity. This extended battery features 3200mAh of power from the highest quality Japanese Cells. The Seidio extended life battery provides up to triple the capacity of your original standard battery. The package includes a door finished to matched your phone.

This extended battery will work with the Samsung Galaxy S II AT&T version only, this will not work with the T-Mobile or Sprint version.

Compatible with the Samsung Galaxy S II AT&T i777 phone model.

Question: Is this a nfc battery
Answer: No. The Galaxy S II i777 does not support NFC.

Question: is this compatible with the S959G phone?
Answer: Yes. From what we can gather, i777 and S959G models use the same build and cases should be cross compatible between the two.

Question: just as a question, why is this battery going for 79.99 when I can find others around the same mAh for less than half this price on ebay and amazon? If this is truely a better buy I will spend the money, but I would like to hear your opinion....
Answer: We no longer offer this battery unfortunately. However a Seidio battery comes with a particular 'guarantee' as it has been put together under a specific set of quality control guidelines and also uses Japanese battery cells in its manufacturing. The same cannot be said about un-branded more 'affordable' batteries from the vendors you've mentioned.